After update on friday, we cannot login to the IMAP server any more. System CENTOS 7.

I suspect the problem in rpm package:
erlang-lager-3.2.4-5.1.el7.kolab_16.x86_64 @Kolab_16 or
erlang-eimap-0.4.2-2.13.el7.kolab_16.x86_64 @Kolab_16 or
guam-0.9.7-4.13.el7.kolab_16.x86_64 @Kolab_16

The system updated the packages last friday

Any help to revert to the previous version would be helpfull until the problem is solved.
I cannot find the the previous version in the repository to downgrade.

Thanks in advance.
Regards,
Luc